Save *-site.xml files configured for hadoop cluster to local machine.

Details

Description

When using whirr to create a hadoop cluster, whirr should save copies of the three *-site.xml files it configures for the hadoop cluster to the local machine. This way when launching a job from the local machine, the job driver can read these config files when creating a new Configuration object, and the hadoop job will be properly configured to execute on the target cluster.